pbatt



(No Model.)

R. N. PRATT.

- No. 477,607. Patented June, 21, 1892;.

I UNITED STATES PATENT OFFICE.

RUFUS N. PRATT, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE PRATT & CADYCOMPANY, OF SAME PLACE.

COCK.

SPECIFICATION forming part of Letters Patent No. 477,607, dated June 21,1892. Application filed July 23, 1891. Serial No. 400,488. (No model.)

To (1. whom it may concern:

Be it known that I, RUFUS N. PRATT, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnccticut, have invented certain new and useful Improvements in Cocks,of which the following is a full, clear, and exact specification.

This invention relates to the class of cocks forstopping or regulatingthe flow of hot or IO cold liquids or vapors so constructed that theymay be renewed, repaired, or cleaned without disturbing the cock fromits connections.

The object of the inventionis to provide a I5 cock of this class whichis durable and cheap in construction with interchangeable faces aroundthe ports held in position by simple means which can be readily removedto free the faces for renewing when they become so worn that the cockleaks.

Referring to the accompanying drawings, Figure 1 is a longitudinalvertical section of the cock. Fig. 2 is a horizontal section. Fig. 3 isa transverse vertical section, and Fig. 4

2 5 is a plan of the cock.

In the views the letter a indicates the body of a closed-bottomfluid-cock cast to shape of any suitable metal, with a central barrel orplug-chamber b, from which open ports 0 to the ends that are providedwith screws or flanges for attachment to the pipes or mains of thesystem in which the cock is to be located.

In the plug-chainber adjacent to and hav- 5 ing an opening thatcoincides with the ports and resting on the bottom or a part of thebottom are loosely placed interchangeable faces d, that are shaped tofit the interior of the chamber. These faces are preferably formed ofasbestus fiber and rubber gum vulcanized and solidified under suitableheat and pressure, so that they become very hard and will retain theirshape under all the degrees of heat to which the ordinary cock issubjected. Of course these faces can be made of other material than thecomposition named. If desired, they may be made of soft metal. Thetapering rotary plug e, having the usual fluid-way, is made considerablysmaller than the interiordiameter of the plugchamber and fits theremovable faces quite closely when held in place by any common form ofgland. Between the removable faces cl, which are held from rising upwardby the tapering plug, are placed holders f, so shaped as to wedge orhold apart the removable faces d. These holders are preferably made ofmetal thinner than the thickness of the faces, curved to fit theinterior of the chamber between the faces, which they rest against andhold in such manner as to prevent any sidewise movement toward or fromeach other past the ports when the plug is rotated. A lug or rib f ispreferably formed in the back of these holders f to fit into a groove orbetween two lugs b on the interior wall of the barrel, so that whendropped into position between the faces the holders cannot themselvesmove sidewise. This condition maybe reversed and the lugs or ribs may beformed on either the holders or on the body and project into acomplementary groove or recess on the other part. These holders areinthe construction shown formed in two separate pieces but of course, ifdesired, they may be united'over the top of the faces, so as to form asingle piece in order that both may be re moved together as a singleholder, without doparting from the construction set forth, except as tojoining them at the top.

The interchangeable pieces are dropped into the barrel of the cock, theholders are placed between the faces, and the plug inserted and securedin place by any common means. 8 To renew, repair, or clean the cockwithout disturbingits connections, the holders may be lifted from thebarrel, and this so frees the faces that they maybe removed and new onessubstituted if they are so worn that the cook 0 leaks. The holdersfirmly seclire in place in a simple manner the faces, which are of suchshape that they exert but little friction upon the plug and are cheapand occupy but little space, so that a number may be kept on hand 5 tobe used when required.

The construction of the cock is cheap and tises in the walls of thechamber, inserted be- 10 there are no parts-which require special.grindtween the faces to prevent them from rotating and fitting tomake-a tight cock. ing, and a rotary plug in contact with the I claim asmy inventionfaces and holding them to the wall, substan- 5 A rotary-plugcock having a body with a tially as specified.

frusto-conical plug-chamber, faces curved t0 RUFUS N. PRATT. conform tothe interior, loosely resting on the E Witnesses: bottom of thechamberadjaccnt to the ports; JUsTUsP. LEWIS, curved wedges with ribsprojecting into mor- HARRY R. WILLIAMS.

